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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edeee718301b6c3e61a276ba521e6f79dfb16953347eee4b60fd55b0422836c7' 
  AND token = 'X0htBQgnsIu8wNFl0vJ1dHv1Tjopk8M8h3AkbVGTyDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}